The self-consistently calculated \(f_\mathrm {Q}(q, t)\)  serves the purpose of witnessing entanglement in a transient \(k\) -partite quantum state when exceeding its operator-specific Cramer-Rao bound [1]}. We note that, as specified by Hauke and coworkers in Ref. [1]}, this protocol requires a careful normalization of the scattering cross section into absolute values by accounting for the trRIXS matrix elements.
